Allow base model creation to take multiple tables as arguments

[Eromtap]

Describe the feature

In my workflow, it is often necessary to copy multiple tables from one schema to another. The base model creation feature in DBT codegen has been awesome, but I altered it to accept more than one table arg at a time. According to the docs, it should have been able to accept multiple args before, but it wouldn't work and I didn't see any iterative logic in bash_scripts/base_model_creation.sh so I added it.

Additional context

I sent a PR ( #225 ) with the changes and was asked to provide a feature request here.

Who will this benefit?

Anyone who needs to generate copies of multiple tables. In my case, my company is moving to a different form of ingest that is requiring copying entire schemas over table by table.

Are you interested in contributing this feature?

I would love to contribute! DBT and Codegen have been game changers and I'd be honored to be a contributor!!!

[dbeatty10]

This sounds good to me as long as it is backwards-compatible. i.e., if a command like the following still works:

dbt run-operation codegen.create_base_models --args '{"source_name": "dbt_dbeatty", "tables": ["raw_orders", "raw_customers", "asdfasdf"]}'

Could you check to see if this would still work or not?